/* Full-screen 3D reconstruction pages (scene3d/). Overlay UI sits on the canvas;
   on phones it stacks (title, then card, then tour) so nothing overlaps. */
:root{--ink:#f6efe2;--muted:#d7cdbd;--gold:#e6b54e;--gold2:#f7d88a;--glass:rgba(14,18,30,.55);--line:rgba(255,255,255,.16)}
*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%;background:#0b0f1a;color:var(--ink);font-family:'Inter',system-ui,sans-serif;-webkit-font-smoothing:antialiased;overflow:hidden}
#stage{position:fixed;inset:0}
#stage canvas{display:block;width:100%;height:100%;cursor:grab}
#stage canvas:active{cursor:grabbing}
a{color:var(--gold2)}
button{font:inherit}
:focus-visible{outline:2px solid var(--gold2);outline-offset:3px}

.s3-title{position:absolute;top:22px;left:26px;max-width:min(520px,80vw);pointer-events:none;text-shadow:0 2px 18px rgba(0,0,0,.45)}
.s3-title a{pointer-events:auto}
.s3-back{display:inline-block;font-size:.78rem;color:var(--muted);text-decoration:none;margin-bottom:14px}
.s3-back:hover{color:var(--ink)}
.s3-lang{margin-left:10px;padding-left:10px;border-left:1px solid var(--line)}
.s3-kicker{font-size:.7rem;letter-spacing:.24em;text-transform:uppercase;color:var(--gold2)}
.s3-title h1{font-family:'Playfair Display',Georgia,serif;font-size:clamp(1.9rem,4.4vw,3.2rem);line-height:1;margin:6px 0 6px}
.s3-title h1 em{color:var(--gold2);font-weight:500}
.s3-sub{font-size:.9rem;color:var(--muted);font-weight:300}

.s3-card{position:absolute;left:26px;bottom:92px;width:min(400px,calc(100vw - 52px));padding:18px 20px;border-radius:16px;background:var(--glass);border:1px solid var(--line);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);transition:opacity .4s}
.s3-card h2{font-family:'Playfair Display',Georgia,serif;font-size:1.25rem;color:var(--gold2);margin-bottom:6px}
.s3-card p{font-size:.88rem;line-height:1.55;color:var(--ink);font-weight:300}
.s3-card:empty,.s3-card h2:empty{display:none}

.s3-tour{position:absolute;left:26px;right:26px;bottom:26px;display:flex;gap:8px;flex-wrap:wrap}
.s3-tour button{padding:9px 16px;border-radius:999px;border:1px solid var(--line);background:var(--glass);color:var(--ink);cursor:pointer;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);font-size:.84rem;transition:.2s}
.s3-tour button:hover{border-color:var(--gold)}
.s3-tour button[aria-pressed="true"]{background:var(--gold);border-color:var(--gold);color:#1b1407;font-weight:600}

.s3-sun{position:absolute;right:26px;top:26px;display:flex;align-items:center;gap:10px;padding:8px 14px;border-radius:999px;background:var(--glass);border:1px solid var(--line);backdrop-filter:blur(10px);font-size:.72rem;color:var(--muted)}
.s3-sun input{width:130px;accent-color:var(--gold)}

.s3-about{position:absolute;right:26px;bottom:26px;max-width:min(420px,40vw);font-size:.76rem;color:var(--muted);text-align:right}
.s3-about summary{cursor:pointer;list-style:none;display:inline-block;padding:8px 14px;border-radius:999px;background:var(--glass);border:1px solid var(--line)}
.s3-about[open]{background:var(--glass);border:1px solid var(--line);border-radius:14px;padding:12px 14px;text-align:left;backdrop-filter:blur(12px)}
.s3-about[open] summary{padding:0 0 8px;border:0;background:none}
.s3-about p{margin-top:6px;line-height:1.5}
.s3-about-body{max-height:min(62vh,560px);overflow:auto;padding-right:6px}
.s3-about-body h2{font-family:'Playfair Display',Georgia,serif;font-size:1rem;color:var(--gold2);margin:14px 0 2px}
.s3-about-body h2:first-child{margin-top:4px}
.s3-about-body h3{font-size:.8rem;color:var(--ink);margin-top:10px}
.s3-about-body ul{list-style:none;margin-top:6px}
.s3-about-body li{line-height:1.8}

.s3-loading{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;background:#0b0f1a;transition:opacity 1.2s;font-family:'Playfair Display',Georgia,serif;font-style:italic;color:var(--muted)}
.s3-loading.done{opacity:0;pointer-events:none}
.s3-bar{width:180px;height:2px;background:rgba(255,255,255,.12);border-radius:2px;overflow:hidden}
.s3-bar i{display:block;height:100%;width:0;background:var(--gold);transition:width .3s}
.s3-fallback{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;padding:24px;text-align:center}
.s3-fallback[hidden]{display:none}

@media (max-width:720px){
  .s3-title{top:54px;left:16px}   /* under the About button, which takes the top row */
  .s3-title h1{font-size:1.7rem}
  .s3-sub{display:none}
  .s3-sun{top:auto;bottom:calc(env(safe-area-inset-bottom) + 70px);right:16px;left:auto}
  .s3-sun input{width:96px}
  .s3-card{left:16px;right:16px;width:auto;bottom:calc(env(safe-area-inset-bottom) + 118px);padding:12px 14px}
  .s3-card p{font-size:.8rem}
  .s3-tour{left:0;right:0;bottom:calc(env(safe-area-inset-bottom) + 14px);padding:0 16px;flex-wrap:nowrap;overflow-x:auto;scrollbar-width:none}
  .s3-tour button{flex:none}
  .s3-about{top:14px;right:16px;bottom:auto;max-width:calc(100vw - 32px);font-size:.72rem}
  .s3-about summary{padding:6px 12px}
  .s3-about[open]{left:16px}
  .s3-about-body{max-height:60vh}
}
@media (prefers-reduced-motion: reduce){ .s3-loading,.s3-card{transition:none} }
#stage:has(.s3-about[open]) .s3-card{opacity:0;pointer-events:none} /* the About panel replaces the card while open */
/* walkable pages (walk.js): a fade between places, and a hint until the visitor starts moving */
.s3-fade{position:absolute;inset:0;background:#0b0f1a;opacity:0;pointer-events:none;transition:opacity .35s}
.s3-fade.on{opacity:1}
.s3-hint{position:absolute;left:50%;top:22px;transform:translateX(-50%);padding:8px 16px;border-radius:999px;background:var(--glass);border:1px solid var(--line);font-size:.78rem;color:var(--ink);pointer-events:none;transition:opacity .6s}
.s3-hint b{font-weight:600;color:var(--gold2)}
.s3-hint .touch{display:none}
@media (pointer:coarse){.s3-hint .key{display:none}.s3-hint .touch{display:inline}}
@media (pointer:coarse){.s3-card{pointer-events:none}}   /* a thumb on the card walks, as it would on the scene */
#stage.touched .s3-hint{opacity:0}
#stage.walking .s3-card{opacity:0;pointer-events:none}
@media (max-width:720px){.s3-hint{top:auto;bottom:calc(env(safe-area-inset-bottom) + 64px)}}